Clockwork-escapement especially applicable to mechanical time-fuses.



ject of the German Emperor,

UNITED STATES PATENT OFFICE. 4

"HUGO I-RAHL, or DUSSELDORF,

GERMANY, ASSIGNOR TO RHEINISCHE METALL- WAAREN- UNI) MASCHINENFABRIK, OF DUSSELDORF-IDERENDORF, GERMANY,

A CORPORATION OF GERMANY.

CLOCKWOBK-E SCAPEMENT ESPECIALLY APPLICABLE TO MECHANICAL TIME-FUSES.

To all whom it may concern. i

Be it known that I, Hoco PRAHL, a subresiding at 14 Moltkestrasse, Dusseldorf, Germany, have "invented certain new and useful Improvements in Clockwork-Escapements Especially Applicable to Mechanical Time-Fuses; and I do hereby declare the following to he a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

' The present invention relates to clockwork escapements, intended for mechanical t me fuses, of the kind in which two sets of pins, teeth or the like arranged in two circles ofdifi'e'rentdiameter, the teeth of one set being staggered with respect to those in the other, are adapted to coiiperate with an anchor ar ranged operatively between the two sets.

The present invention ,diifers from the known constructions of this kind, in that the anchor constructed as a segment of a circle.

is journaled between the rows of pins in such a manner that the cylindrical part of 'the periphery of the anchor cooperates, in

both directions of-its swing, with a pin to form, a. stop for the escapement wheel.

Q'neconstruction of the invention is illus trated in the accompanying drawings in which Figure 1 shows the escapement section, while Fig. 2isa plan view. F1gs.'3 and 4- show the escapement wheel carrying the teeth or projections and the anchor. in two difi'erent positions.

The'axis f of the segmental anchor E is journaledin the plate a and a bridge-piece b, and is made solid instead of hollow as are the cylinders of previous known' repose escapements. Between the plate a and a second plate a the escapement wheel D is journaled and the latteris provided with two rows of pins d and d, the pins (1 forming a smaller or inner circle and pins d a ,4 larger or outer circle on the wheel, the two not shown. The balance spring actuating groups of pins breaking oint with each other, that is to say they are on different radii 'of the circles. The escapement wheel D is driven in the direction of the arrow 9 by means of a spring or other suitable means Specification of Letters Patent.

Patented July 27, 1915.

Application filed January 14, 1914. Serial No. 812,096.

the anchor E is for the sake of clearness. In its normal po' sition, that is to say, when it is not subjected to any strain, it holds theanchor, in the position shown in Fig. 3. As soon as the escapement wheel strikes with pin (1 on the portion 6 of the flat face of the anchor E, the latter is turned in the direction of the arrow It (Fig. 4.) until the pin d slidespast and ofi the, flat face; at this moment the pin 0Z commences to bear against the ir'gce of the anchor, thus stopping the wheel owing to its momcntum until this is overcome by the regulating spring, whereupon the anchor swings back. Owing to this the pin cl? strikes theportion e of the fiat surface of the anchor and imparts to it a fresh impulse in the direction opposite to the arrow h, until'the pin d in turnislides ofi the surface 6 arrives against the cylindrical face of the anchor and so brings the escapement wheel D again to rest. After the commencement of the return swing of the anchor the pin d bears on the surface 6 movement is repeated. F If the escapement is to be constructed as a recoil escapement, it is only necessary to mount the anchor E with its circumference eccentric to thepivot f as the dotted seg ment z in Fig. 4 indicates.

If'claim as my invention:

l. .A clockwork escapement adapted for mechanical time fuses comprising an escapement wheel, inner and outer series of projections on said escapement wheel, arranged on different radii, and-an anchor pivotally mounted within the path of said projections, said anchor having a flat edge and a roundomitted from the drawings At this moment the next pin 03' (Fig. 3) and the' cylindrical ed edge with which said projections altercircles described by saici pins in the revolw In testimony whereof, I have signed this hon of Sand heel, 521 1d segment hevmg a spemfieamon 1n the presence oi two'subscrlbrounded. and a. flat edge wlth. Wh1Ch- 111g wltnesses.

ed es the )1115 of the two series alternate: Y HUGO PRAHL.

v D n 5 engage, szud rounded edge formlng a step \Vltnessestfor smd esenpemeni- Wheel, when the pro RUDOLF FELDMNLER,

jest-ion of either set contacts herewith. CHRIS VAHDORY. 

